Fuse-plug-cap assembly



July 26, 1927.

1,637,274 N. w. NUTT Y n FUSE PLUG CAP ASSEMBLY Filed Jan. 25. 1927 l ffimmumnm ml- -6 `Patented July Z6, 1927.

UNITED STATES 1\TOR1VIAN W.VNUTT, OF TRENTON, NEW JERSEY.

FUsE-PLUG-CAP ASSEMBLY.

- VApplication.filed January `25, 1927. Ser'aI No. 163,468.

projections on the different parts to prevent separation or rotation, but this method is eX- pensive and somewhat unsatisfactory, as the joining method has a tendency to loosen, and to secure satisfactory results it has been in a number of cases necessary to" cement the' parts to prevent any loosening thereof.

A further yobject of the invention is to provide, in a manner as hereinafter set forth, a fus-e plug cap assembly Vhaving the insulat4 ing plug body thereof formedfwith a tapered cap member receiving terminal portion or extremity provided at its point of largest diameterwith an annular-peripheral shoulder acting as an abutment for the cap member and further greatly facilitating the manufacturing of the insulating plug` body.

Further objects of they invention are to provide, in a manner as hereinafter set forth a fuse'plug cap assembly including'means for joining the cap member tothe plug body in a simple, eiiicient and expeditious manner, and further to provide a fuse plug cap assembly which isy strong, durable, compact, readily assembled, and comparatively inexpensive to manufacture.

lVith the foregoing and other objects in view the invention consists of the novel construction, combination and arrangement of parts as hereinafter more specifically described, and illustrated in the accompanying` drawings, wherein is shown an embodiment of thevinvention, but it is to be understood that changes, variations, and modifications can be resorted to which fall within the scope of the claims hereunto appended.

In the drawings wherein like reference characters denote corresponding parts throughout the several views:

Figure l is .an elevation of a fuse plug cap assembly in accordance withthis invention.

Figure 2 is a sectional elevation of the outer section or part of the p'lug body and tfurther illustrating a cap meinberinposiion. Figure i?) plugcap assembly. e

Figure i is a section on line 4. 4 .Figure 2. Figure 5 is a view similar to Figure 2 of a modified form.

Figure-6 is va section on line 6 6 Figure 5. 1

As is well known, the body of the fuse plugs, now generally employed, is construct` ed of insulation mate-rial and formed of hollow out-er part Vor section open at each end and a hollow inner part or section closed at its in-nerend. The sections are secured together in abutting relation, preferably by cementitious material. lThe outer section of the plug body is indicated at l andthe inner section thereof at 2 in Figure l.

The invention forming the subject matter of this application relates solely to the outer terminal portion or extremity of the plug body,y or ratherthe outer terminal portion or extremity of said outer section 1, in connection with a `cap member referred to by the reference character 3.. The cap member is utilized for maintaining a transparent closurek 4.. in position within the outer end of the section l. Said closure permits of viewing; the interior of the fuse plug when required. The cap member 3 is constructed from any suitable, slightly yieldable material, preferably thin metal.

The section 'l has` its outer periphery at the outer terminal portion orextremity 6, tapered as at 5, and atthepoint of largest diameter' of the taperedv outer face cf the outer terminal portion 6, an ainn'ilar shoulder 7 is formed which constitutes an abutment. The outer end edge of the section l is rabbeted, as 8, tokprovide a seat for a transparent closure 4, and when the latter is in position the outer face thereofis flush with the non-rabbeted part ofthe outer end edge of the section l. The tapered outer face 5 of the terminal portion 6, from the shoulder 7 tothe outer edge of the section l, is knurled, corrugated or ribbed throughout. The high parts of the corrugations or the ribs are indicated at 9 and which are disposed throughout at an inclination and the inclination is inwardly from the shoulder 7 to the outer end edge of the section l. The high part of the corrugations or the ribs 9 are arranged inis a top'V plan views-of the fuse ward'ly with respect to the outer peripheral edge of the shoulder 7. Or in other words the transverse width of the shoulder 7 is greater than the thickness of the. high part or rib 9.

The cap member 3 comprises a flat annulus 10 and a rim .11. r1`he annulus 10 has its inner diameter materially lessthanthe diameter of the closure 4. The annulus 10 merges into the rim 11, and is tapered, eX- tends inwardly and is of a diameter to frictionally engage theribs or high parts of the corrugations 9 to distort the rim and set up a rictional forcing lock, whereby the cap member 3 will be secured to the section 1 in a manner to prevent the separation and rotation of such member relative to the section 1. The diameter of the rim 11 is slightly less than the outer diameter of the shoulder 7 and the latter provides an abutment for the edge of the rim 11. The construction shown in Figures 5 and 6 is the same as that shown in Figures 3 and 4, with this exception that the tapered outer' face 12 of the outer terminal portion or extremity 13 of the section 1 is not corrugated, ribbed or knurled, but is plain. Otherwise than that as stated the construction shownv in Figures 5 and 6 is the same as that shown in Figure 2 and corresponding parts are provided with like reference characters.

The transparent closure 4 is constructed of insulation material, and the annulus 10 of the cap member 3 overlaps the marginal portion of the closure 4 for the purpose of retaining the closure on its seat.

It is thought the many advantages of a fuse plug cap assembly, in accordance with this invention, can be readily understood, and although the preferred embodiment of the invention is as illustrated and described, yet it is to be understood that changes in the details of construction can be had which will fall within the scope of the invention as claimed.

lVhat I claim is:

1. In a fuse plug cap assemblyan insulating fuse plug body having a tapered extremity and an annular' shoulder at the point of largest diameter of said extremity, said tapered extremity being serrated.

2. An insulating body for fuse plugs having a serrated tapered extremity formed with an extending shoulder, and a cap member secured to such extremity by a frictional v sulating closure mounted in said extremity, a

cap member mounted on said extremity and secured therewith by a frictional forcing lock, said cap member abutting said shoulder and overlapping said closure.

5. A fuse plug cap assembly comprising an insulation plug body having a part of its periphery vtapered and further having a rperipheral shoulder at one end of said part,

a cap `member frictionally engaging with said part, and a transparent portion mounted in theplug body and overlapped by said member, and the said tapered peripheral part being serrated.

A fuse plug cap assembly comprising an insulation plug body having a part of its periphery tapered and further having a peripheral shoulder at one end of said part, a cap member rictionally engaging with said part, and a transparent portion mounted in the plug body and overlapped by said member, and the sald tapered peripheral part being serrated, and said shoulder extended from said part and of annular contour.

7. A fuse plug cap assembly comprising an insulating plug body having its outer end edge formed with a rabbet and further having the outer periphery of its outer terminal portion serrated and tapered, said body further formed with a peripheral shoulder at the inner end of said tapered periphery, a transparent closure mounted in said rabbet, and a tapered cap member overlapping the closure, abutting said shoulder and secured with said serrated periphery by a frictional forcing lock. y

In testimony whereof, I- affix my signature hereto.

NORMAN W. NUTT. 

